Microchip® Advanced Software Framework

The supported board list:

• SAMC21 Xplained Pro

The RS-485 Xplained Pro Board must be connected to extension header 1 on the SAM C21 Xplained Pro.

This quick start demonstrate how to configure RS485 mode, according to your configuration CONF_RS485_MODE. For RS485 master, it can send message to slave. For RS485 salve, it can receive message from slave.

To use the example:

1. Install jumper between pins 2 and 3 on J101. This enables the TE pin to manage both DE and RE for Half-Duplex operation.
2. Install jumper between pins 3 and 4 on J102. This removes the Profibus Termination for A/B.
3. Install jumper between pins 1 and 2 on J103. This removes the Profibus Termination for Z/Y.
4. Install jumpers on J106 and J107. This connects A/Y and B/Z to form half-duplex A/B differential pair. Alternatively, this can be done by jumpering RXP to TXP and RXN to TXN, or pins 2 and 5 and pins 3 and 4 on the screw terminal block.

Refer to: http://ww1.microchip.com/downloads/en/AppNotes/Atmel-42468-RS-485-Communications-using-the-SAM-C21-Xplained-Pro-and-RS-485-Xplained-Pro_ApplicationNote_AT8547.pdf for more information